Improvement in dividers



No. 12;,359E Pmmed Dec. 12.1871.

PATENT OFFICE.

ALBERT A. COOK, OF MILFORD, MASSACHUSETTS.

IMPROVEMENT IN DIVIDERS.

Specification forming part of Letters Patent No. 121,850, dated December 12, 1871.

To all whom it may concern:

Be it known that I, ALBERT A. COOK, of Milford, countbY of Worcester, State of Massachusetts, have invented certain new and useful Improvements in Dividers, of which the following is a speciiication:

The nature of my invention consists in forming in one leg of a pair of dividers a semi-cylindrical groove, and in combining with the same a screw, clasp, and movable leg.

Figure 1 is a perspective view of my invention. Fig. 2 is an elevation of the same. Fig. 3 is a cross-section on the line x y, Fig. 2. Fig. 4 is a cross-section on the line Z Z, Fig. 2.

A and B are the two legs of the dividers, tlie upper joint, the holding-arc H, the screws K and L, and spring S all being made in the usual manner. The leg A is made in section, as shown in Fig. 3-that is, a semi-cylindrical groove extends along the inner part of the leg, into which the movable leg C fits. The leg A is also provided With a slit, a. a, and a pair of ears, n u. The ears n n, together With a part of the leg adjoining, form a clasp for the movable leg C. D is a thumbscrew, which serves to draw the ears n n together, and thus to hold the leg C firmly in place. As the leg C fits closely in the cylindrical groove in the inner part of the leg A, and is also held by the ears ofthe clasp n a, it is as rigid as though a part of the leg itself.

I claimv as my invention- In a pair of dividers, the combination of the cylindrical extension C and the leg A, provided with a semi-cylindrical groove upon its inner side, with the slit a a, with the ears n n, and With the thumb-screw D, all constructed, arranged, and operated substantially as described and shown.

ALBERT A. COOK.

Witnesses SAML. P. ALLEN,

FRANK G. PARKER. (97) 

